Tooth-beam for harrows.



No. 627,84I. Patented lune 27, |899. W. C. CHAMBERLAIN.

TOOTH BEAM FUR HARROWS.

[Applicatiun tiled Ju1y`9, 1898.)

j. -u A w (No Model.)

PATENT FFICE.

IVILLIAM C. CI-IAMBERLAIN, OF DUBUQUE, IOWA.

TOOTH-BEAM FOR HARROWS.

SPECIFICATION forming part of Letters Patent No. 627,841, dated .I une2'?, 1899.

Application iiled July 9, 1898. Serial No. 685,468. (No model.)

T0 all whom t may concern:

Be it known that I, WILLIAM C. CHAMBER- LAIN, a citizen of the UnitedStates,`residing at Dubuque, in the county of Dubuque and 'State ofIowa, have invented certain new and useful Improvementsin Tooth-Beamsfor Harrows; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to tooth-beams for harrows and to the manner ofsecuringthe-teeth to the same; and it consists of certain novelconstructions, combinations, and arrangement of parts, as will behereinafter described and specifically claimed.

A Considerable difficulty has been experienced in the past in providinga simple yet adequate means for securely holding the teeth in place andpreventing the teeth from slipping and becoming lost and at the sametime having them capable of adjustment. It is also important that thebeam should be light and yet very strong. It is to accomplish theseobjects that my present invention is designed.

ln the accompanying drawings, Figure l is a perspective view of myimproved toothbeam 'and means for securing a tooth in position upon thesame. Fig. 2 isa vertical section through the same. Fig. 3 is ahorizontal section. Fig. 4 is a perspective view showing the inner faceof one of the clamping-plates, and Fig. 5 isa perspective view showingthe outer face of one of the clamping-plates against which, thebarrow-tooth rests.

A in the drawings represents my improved harrow tooth-beam, which isconstructed of twoy metal angle-bars a d', preferably of halfhexagonalshape, which bars when brought together, as shown in Fig. l, constitutean approximately hexagonal-shaped angle-beam, the bars being'leftseparated for the admission of means for holding the teeth securely inposition and for the application of means 'for bracing the beam. Thisform of toothbeam is very strong and yet very light and has been foundexceedingly practical and. desirable for the purpose desired.

B B' represent clamping-plates which are applied on each side of thetooth-beam. The

,clearly shown in Fig. 2.

plate B is similar to the plaie B', with the exception that it isprovided on its front face with a deep vertical groove b, within whichthe tooth C is seated and by which it is prevented from having a lateralmovement.

lBoth of the plates B B are provided with transverse passagesb' b2,through which a tooth-bolt D passes, as shown in the drawings. Theclamping-plates B B are also provided on their inner faces with angulargrooves b3 b4 and a central projection b5, the former receiving theedges of themetallic bars constituting the tooth-beams and the centralprojections b5 of the plates occupying the spaces between the edges ofthe said bars a a.

The tooth-bolt D is formed on one end with a square or other suitableshaped eye to correspond with the shape and size of the harrow-tooth Cand provided on its other end with a screw-thread on which is applied anut d" for holding the whole structure tightly together. By thisconstruction and arrangement the tooth-beam is securely bridged andclamped, Wherebythe beam is considerably stiffened and strengthened.

The barrow-tooth C is notched at intervals,

groove b, which groove is .deep enough to penetrate the horizontalgrooves h3 b4, the l notches will be engaged by the edges of the bars ad', constituting the tooth-beam A, and thus prevent the tooth fromslipping vertically.

In order to prevent the nut d from turning, and thus allowing the partsto 'become loosened, I provide a lock E, which latter consists of apiece of metal having two horizontal flat portions and a iiat connectingportion, the connecting portion being provided with an aperture throughwhich the bolt D passes. The nut-lock is applied on the tooth-bolt andthe nut screwed up, and then the ends are turned over, one of the endsresting against one sideof'the nut and the other resting on the side ofone of the clamping-plates, as

ABy this construction and arrangement it will be impossible for the nutto unscrew or become loose.

Having now described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is-

1. A tooth-beam for a harrow, comprising in its construction twohalf-hexagonal bars with a space between them, in combination withclamping-plates applied'on each side of the beam, each plate beingprovided with a transverse opening and horizontal grooves on its innerface, a tooth-bolt passed through the clam ping-plates and between thebars constitutin g the tooth-beam, said bolt being formed at one endwith an opening to receive a harrow-tooth and on its other end with ascrewthreaded portion, a harrow tooth passed through the said opening ofthe bolt, and a nut applied on the screw-threaded end of said bolt,substantially as described.

2. A tooth-beam for a harrow, comprising in its construction two barswith a space between them, in combination with clampingplates applied oneach side of the beam, each plate being provided with a transverseopening and grooves on its inner face,one of said plates being providedon its outer face with a deep, vertical groove which penetrates thegrooves on the inner face, a tooth-bolt passed through theclamping-plates, and between the bars constituting the tooth-beam, saidbolt being formed on one end with an opening and at'its other end with ascrew-threaded portion, a harrow-tooth applied in the said opening ofthe tooth-bolt, said tooth. being provided with notches which engage theedges of the tooth-beam, and a nut Vapplied on the screw-thread edportion of the tooth-bolt, substantially as described.

3. A tooth-beam for a harrow, comprising in its construction two barswith a space between them, in combination with clampingplates 'appliedon each side of the beam, each plate being provided with a transverseopening and horizontal grooves on its inner face, a tooth-bolt passedthrough the clampingplates and between the bars constituting thetooth-beam, said bolt being formed at one end with an opening toreceivea barrow-tooth and on its other end with a screw-threadedportion, aharrow-tooth passed through the said opening of thetooth-bolt, a nut applied on the screw-threaded end of said bolt, anutlock provided with an aperture through which the tooth-bolt passes,the said nut-lock bearing with one of its ends upon one side of the nutand with its other end upon the edge of one of the clamping-plates,substantially as described.

4. A tooth-beam for a harrow, comprising in its construction two barswith a space between them, in combination with ,clampingL plates appliedon each side of the beam, each plate being provided with a transverseopening and grooves on its inner fa'ce, one of said plates beingprovided on its outer face with a deep, vertical groove, whichpenetrates the grooves on the in ner face, a tooth-bolt passed throughthe clamping-plates and between the bars constituting the tooth-beam,said bolt being formed at one end with an opening and at its other endwith a screw-threaded portion, a barrow-tooth applied inthe said openingof the tooth-bolt, said tooth being provided with notches which engagethe edges of the tooth-beam, a nut applied on the screwthreaded portionof the tooth-bolt, and a nutlock provided with an aperture through whichthe tooth-bolt passes, the said nut-lock bearing with one of its endsupon one side of the nut and with its other end upon the edge of one ofthe clamping-plates, substantiall;T as described.

In testimony whereof I hereunto aiiix my signature in presence of twowitnesses.

WILLIAM 0. CHAMBERLAIN.

